CD8A and influenza: 2012). Chloroquine improves CD8+ T cell responses in mice following a single administration of influenza vaccines (Garulli et al. 2013). Although the analogs have been reported to be effective against IAV in vitro and used in in‐vivo experiments and clinical trial for prevention or treatment of influenza (Paton et al. 2011; Borba et al. 2012), the effectiveness of analogs as anti‐influenza drugs is questioned, and cautions in their uses are recommended (Wu et al. 2015).